Texas Instruments LMX1205 Handleiding

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LMX1205 Low-Noise, High-Frequency JESD Buffer/Multiplier/Divider

1 Features

•Output frequency: 300MHz to 12.8GHz

•Noiseless adjustable input delay up to 60ps with

1.1ps resolution

•Individual adjustable output delays up to 55ps with

0.9ps resolution

•Ultra-low noise

–Noise floor: –159dBc/Hz at 6GHz output

–Additive jitter (DC to f

CLK

): 36fs

–Additive jitter (100Hz to 100MHz): 10fs

•Four high-frequency clocks with corresponding

SYSREF outputs

–Shared divide by 1 (Bypass), 2, 3, 4, 5, 6, 7,

and 8

–Shared programmable multiplier x2, x3, x4, x5,

x6, p1-x7 and x8

•LOGICLK output with corresponding SYSREF

output

–On separate divide bank

–1, 2, 4 pre-divider

–1 (bypass), 2, …, 1023 post divider

–Second logic clock option with additional divider

1, 2, 4 & 8

•Six programmable output power levels

•Synchronized SYSREF clock outputs

–508 delay step adjustments of less than 2.5ps

at 12.8GHz

–Generator, repeater and repeater retime modes

–Windowing feature for SYSREFREQ pins to

optimize timing

•SYNC feature to all divides and multiple devices

•Operating voltage: 2.5V

•Operating temperature: –40ºC to +85ºC

2 Applications

•Test & Measurement:

–Oscilloscope

–Wireless equipment testers

–Wideband digitizers

•Aerospace & Defense:

–Radar

–Electronic warfare

–Seeker Front end

–Munitions

–Phase array antenna / Beam forming

•General Purpose:

–Data converter clocking

–Clock buffer distribution / division

3 Description

The high frequency capability, extremely low jitter

and programmable clock input and output delay

of this device, makes a great approach to clock

high precision, high-frequency data converters without

degradation of signal-to-noise ratio. Each of the four

high frequency clock outputs and additional LOGICLK

outputs with larger divider range, is paired with a

SYSREF output clock signal. The SYSREF signal

for JESD204B/C interfaces can either be internally

generated or passed in as an input and re-clocked

to the device clocks. The noiseless delay adjustment

at input path of the high frequency clock input

and individual clock output paths insures low skew

clocks in multi-channel system. For data converter

clocking application, having the jitter of the clock

less than the aperture jitter of the data converter

is important. In applications where more than four

data converters need to be clocked, a variety of

cascading architectures can be developed using

multiple devices to distribute all the high frequency

clocks and SYSREF signals required. This device,

combined with an ultra-low noise reference clock

source, is an exemplary choice for clocking data

converters, especially when sampling above 3GHz.

Package Information

PART NUMBERPACKAGE

(1)

PACKAGE SIZE

(2)

LMX1205RHA (VQFN, 40)6mm × 6mm

(1)For all available packages, see Section 11.

(2)The package size (length × width) is a nominal value and

includes pins, where applicable.

ADVANCEINFORMATION

LMX1205

SNAS850 – DECEMBER 2024

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. ADVANCE INFORMATION for preproduction products; subject to change

without notice.

Product specificaties